locomotive running kilometers

例句：

1. 1. The engineers were busy working on the new locomotive.
   工程师们忙于修理新机车。
2. 2. The locomotive was a symbol of progress in the industry.
   这台机车是该行业进步的象征。
3. 3. The train's locomotive was loud and noisy, causing much concern among passengers.
   火车的机车声音很大，让乘客们很担忧。